I am a part time adjunct professor at several schools, and since the institutions I work for have chosen not to pay me a full time salary, I do not have time to write letters of recommendation, which take a considerable amount of time if they are going to be relevant. I suggest you inquire from a fuil time or tenured professor for this sort of material.

In 15 years of teaching, I have always offered an opportunity to be contacted by the programs to which you are applying. I have never been contacted by any of them. Ever.  It makes me think they don't count for much, and as such, feel like it is a waste of my time.

I suggest you contact your school administrator to get a letter of recommendation. I have provided a general letter to each of the schools I work for, and it should suffice.